EP0662113B1 - Vorbehandelte tonen, ihre bereitung und verwendung für nicht-schädliche bohrschlämmen - Google Patents

Vorbehandelte tonen, ihre bereitung und verwendung für nicht-schädliche bohrschlämmen Download PDF

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Publication number
EP0662113B1
EP0662113B1 EP93920809A EP93920809A EP0662113B1 EP 0662113 B1 EP0662113 B1 EP 0662113B1 EP 93920809 A EP93920809 A EP 93920809A EP 93920809 A EP93920809 A EP 93920809A EP 0662113 B1 EP0662113 B1 EP 0662113B1
Authority
EP
European Patent Office
Prior art keywords
clay
water
mud
dispersant
dispersion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP93920809A
Other languages
English (en)
French (fr)
Other versions
EP0662113A1 (de
Inventor
Stefano Carminati
Giovanni Burrafato
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eni Tecnologie SpA
Eni SpA
Original Assignee
Eni Tecnologie SpA
Eni SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Eni Tecnologie SpA, Eni SpA filed Critical Eni Tecnologie SpA
Publication of EP0662113A1 publication Critical patent/EP0662113A1/de
Application granted granted Critical
Publication of EP0662113B1 publication Critical patent/EP0662113B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/02—Well-drilling compositions
    • C09K8/04—Aqueous well-drilling compositions
    • C09K8/14—Clay-containing compositions
    • C09K8/18—Clay-containing compositions characterised by the organic compounds
    • C09K8/22—Synthetic organic compounds
    • C09K8/24—Polymers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/02—Well-drilling compositions
    • C09K8/04—Aqueous well-drilling compositions
    • C09K8/14—Clay-containing compositions
    • C09K8/145—Clay-containing compositions characterised by the composition of the clay
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S507/00—Earth boring, well treating, and oil field chemistry
    • Y10S507/901—Organically modified inorganic solid

Definitions

  • the present invention relates to pre-treated clays, their preparation, and their use in formulating drilling muds which are not aggressive to layer clays.
  • water-based fluids which contain clays, in particular bentonite, and various kinds of additives, among which the necessary dispersants in order to obtain the desired rheological properties.
  • these water-based muds display the advantage of a lower cost and lower polluting capability; unfortunately, they display the drawback of being aggressive to the clay layers met during the borehole drilling and to the clay scraps generated during the course of the same drilling.
  • the aggressivity is partially due to the dispersants, generally of polymeric type, added to the mud in order to favour the dispersion of bentonitic clay and endow the mud with suitable fluidity.
  • the polymeric dispersant is only partially adsorbed on bentonite, that portion of dispersant which remains free in solution can thus act also on layer clay and on the clay contained in the drilling scrap material, increasing the above problems.
  • GB-A-2,216,574 teaches the addition of a polyglycerol to the drilling mud, as a solution to the problem.
  • EP-A-333,458 discloses mixtures of water-soluble, high-molecular-weight additives capable of forming strong enough nucleophilic sites when treated with bases and one or more potassium salts having a high enough alkalinity to increase the pH value of the drilling mud up to a higher value than 9.
  • the present invention relates to a process for preparing aqueous clay-based drilling muds which are not aggressive to layer clays, which process comprises:
  • the clay used in order to prepare the mud is bentonite.
  • the most commonly used water-soluble dispersing agent in order to fluidify bentonite-based muds are lignosulfonates, lignites, polyacrylates and partially hydrolysed polyacrylamides.
  • the dispersants are polyacrylates or their copolymers, still more preferably polyacrylates.
  • the necessary dispersant amount in order to fluidify said muds depends on the chemical nature of the same dispersant, and on the type of bentonite.
  • ligninic dispersant When ligninic dispersant are used, such an amount is generally comprised within the range of from 0.5 to 3% by weight based on the mud, whilst when polymeric dispersants are used, such an amount is comprised within the range of from 0.03 to 0.5% by weight.
  • the clay may be suspended in water and the dispersant added, or, indifferently, the aqueous solution of dispersant may be added to pristine clay.
  • the aqueous dispersion of bentonite and the dispersant are mixed for a time period which is at least long enough in order to obtain the adsorbtion of the dispersant; said time period generally is of the order of approximately 30 minutes.
  • the dispersant is adsorbed on clay surface, with the balance remaining in the solution.
  • the amount adsorbed on clay surface is the amount which corresponds to the solid-dispersant equilibrium. For dispersants of polyacrylic type, this amount is of approximately one third of the total amount added in order to fluidify the mud.
  • the temperature at which the clay is equilibrated with the dispersant is not determinative; preferably, the process is carried out at a temperature comprised within the range of from 10 to 40°C.
  • the pre-treated clay i.e., the clay with its surface coated with dispersant additive, is then recovered.
  • Said clay can be separated from the aqueous solution according to well-known techniques of liquid-solid separation, preferably by centrifugation.
  • This clay recovery step can be followed by one or more washing steps with water, so as to completely remove any dispersant which is not strongly bonded to clay.
  • the so treated clay is then re-dispersed in water, and the resulting mud is used as a borehole drilling fluid, particularly suitable for drilling oil wells having temperatures of approximately 120-170°C.
  • the resulting drilling mud can be admixed with other additives as usually employed in the end formulation. So, for example, thickening agents, fluid-loss agents, filtrate control agents, and so forth, can be added.
  • water-soluble salts can be added in order to regulate the ionic strength, as well as suitable substances for adjusting the pH value of the same mud at the desired value.
  • the pH value of the so formulated mud is comprised within the range of from 9 to 12.
  • the re-dispersion in water of the so treated bentonite does not cause the removal of the adsorbed dispersant (at least under customary drilling mud use time and temperature conditions). This means that said adsorbed dispersant will continue to perform its task as bentonite dispersant also in the absence of other dispersants in solution.
  • the so prepared mud by being practically free from water dissolved dispersant, demonstrates to be less aggressive to layer clays and the overall process requires a lower consumption of dispersant additive, because the not adsorbed amount contained in the initial aqueous solution can be easily recovered and recycled.
  • the pre-treated clay according to the present invention can also be stored for long time and used when necessary in order to prepare the drilling mud.
  • a dispersion of bentonite in water is prepared with a suitable amount of dispersant; the clay dispersion is centrifuged and (1) a compact sediment of clay with adsorbed dispersant and (2) a water solution containing non-adsorbed dispersant (supernatant) are obtained.
  • the so prepared bentonite (step 1) is the base component for preparing the non-aggressive mud.
  • dispersant added to the dispersion is adsorbed on clay and the reversibility of adsorbtion were verified by using an aqueous dispersion of homoionic sodium montmorillonite SWy-1 from Wyoming, with the dispersant being a commercial polyacrylate having an M w of approximately 4000, prepared under the following conditions: Na-montmorillonite: 0.27% w/w, dispersant: 0.13% w/w, salinity: 0.05, M NaCl, pH: 11.
  • the so prepared dispersion is allowed to equilibrate during 16 hours and then is submitted to a 2-hour centrifugation at 14,000 rpm.
  • the obtained supernatant was submitted to a TOC (Total Organic Carbon) analysis in order to determine the amount of free dispersant contained in solution, in the initial dispersion.
  • the sediment (bentonite with adsorbed dispersant) was re-dispersed in a fresh solvent, having, in this circumstance, the same salinity and pH conditions as of the initial dispersion (pH 11, 0.05 M NaCl), and the dispersion was then allowed to equilibrate for 16 hours.
  • HRT hot-rolling test
  • the test is carried out by adding to the dispersion known amounts of layer clay in granular form, with defined particle size (2-4 mm).
  • the so prepared dispersion is submitted to heat ageing for a 4-hour time at 93°C, inside a container kept rolling at a revolution speed of 17 rpm. Finally, the dispersion is cooled and from it the residue of granular clay is removed.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)
  • Colloid Chemistry (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Silicates, Zeolites, And Molecular Sieves (AREA)
  • Treatment Of Sludge (AREA)
  • Lubricants (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)
  • Removal Of Floating Material (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)

Claims (10)

  1. Verfahren zur Herstellung von wässrigen Bohrschlämmen auf Tonbasis, welche gegenüber Schichttonen nicht aggressiv sind, wobei das Verfahren umfaßt:
    (i) Dispergieren von Ton in einer wässrigen Lösung, welche eine Menge von 0,03 bis 3 Gew.-%, bezogen auf den Schlamm, eines wasserlöslichen Dispergiermittels enthält, zur Fluidifikation des Schlamms,
    (ii) Trennen des Tons von der wässrigen Lösung, welche das nicht adsorbierte wasserlösliche Dispergiermittel enthält,
    (iii) Redispergieren in Wasser den so behandelten Ton, um den Schlamm herzustellen.
  2. Verfahren nach Anspruch 1, bei welchem dieser Ton Bentonit ist.
  3. Verfahren nach Anspruch 1, bei welchem das wasserlösliche Dispergiermittel ein Polyacrylat oder ein Copolymeres hiervon ist.
  4. Verfahren nach Anspruch 3, bei welchem das wasserlösliche Dispergiermittel ein Polyacrylat ist.
  5. Verfahren nach Anspruch 1, bei welchem dieser Ton von der das wasserlösliche Dispergiermittel enthaltenden wässrigen Lösung durch Zentrifugieren abgetrennt wird.
  6. Vorbehandelter Ton, erhalten durch die Herbeiführung des Inkontaktkommens von Ton mit einer wässrigen Lösung, welche eine Menge von 0,03 bis 3 Gew.-%, bezogen auf den Schlamm, eines wasserlöslichen Dispergiermittels enthält, zu seiner Fluidifikation und anschließendes Trennen dieses Tones von der wässrigen Lösung, welche das nicht adsorbierte wasserlösliche Dispergier-mittel enthält, dadurch gekennzeichnet, daß der so abgetrennte vorbehandelte Ton, einmal in Wasser redispergiert, eine Menge an wasserlöslichem Dispergiermittel gleich oder niedriger als 12 ppm freisetzt.
  7. Vorbehandelter Ton nach Anspruch 6, in welchem dieser Ton Bentonit ist.
  8. Wässrige Bohrschlammzusammensetzung, enthaltend einen vorbehandelten Ton wie in Anspruch 6 angegeben.
  9. Verfahren zum Bohren von Schichttone enthaltenden Ölbohrlöchern, welches die Verwendung einer wässrigen Bohrschlammzusammensetzung nach Anspruch 8 umfaßt.
  10. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß bei Verwendung von ligninartigen Dispergiermitteln die Menge innerhalb des Bereiches von 0,5 bis 3 Gew.-%, bezogen auf den Schlamm, liegt, und bei Verwendung von polymeren Dispergiermitteln die Menge innerhalb des Bereiches von 0,03 bis 0,5 Gew.-% liegt.
EP93920809A 1992-09-24 1993-09-23 Vorbehandelte tonen, ihre bereitung und verwendung für nicht-schädliche bohrschlämmen Expired - Lifetime EP0662113B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ITMI922188A IT1255519B (it) 1992-09-24 1992-09-24 Argille pretrattate, loro preparazione ed impiego nella formulazione di fanghi di perforazione non aggressivi verso le argille di strato
ITMI922188 1992-09-24
PCT/EP1993/002586 WO1994006881A1 (en) 1992-09-24 1993-09-23 Pretreated clays, their preparation and use in formulating drilling muds not aggressive to layer clays

Publications (2)

Publication Number Publication Date
EP0662113A1 EP0662113A1 (de) 1995-07-12
EP0662113B1 true EP0662113B1 (de) 1999-03-17

Family

ID=11363990

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93920809A Expired - Lifetime EP0662113B1 (de) 1992-09-24 1993-09-23 Vorbehandelte tonen, ihre bereitung und verwendung für nicht-schädliche bohrschlämmen

Country Status (13)

Country Link
US (1) US5646092A (de)
EP (1) EP0662113B1 (de)
JP (1) JPH08503494A (de)
CN (1) CN1042740C (de)
AT (1) ATE177777T1 (de)
BR (1) BR9307081A (de)
CA (1) CA2145090A1 (de)
DE (1) DE69324026T2 (de)
DK (1) DK0662113T3 (de)
ES (1) ES2128435T3 (de)
IT (1) IT1255519B (de)
NO (1) NO951092L (de)
WO (1) WO1994006881A1 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19727541A1 (de) * 1997-06-28 1999-01-07 Sueddeutsche Kalkstickstoff Feststoff-Zusammensetzung auf Basis von Tonmineralien und deren Verwendung
CN104480927A (zh) * 2014-10-29 2015-04-01 上海市政建设有限公司 土体改良的施工方法
WO2016175774A1 (en) 2015-04-29 2016-11-03 Halliburton Energy Services, Inc. Grout fluids for use in a geothermal well loop
US10053611B2 (en) * 2016-03-22 2018-08-21 Saudi Arabian Oil Company In situ generation of nano-clay drilling fluid
CN110066661B (zh) * 2019-04-23 2021-04-09 中铁四局集团有限公司 一种圆砾地层深大基坑地下连续墙护壁泥浆及其配置方法
WO2021046294A1 (en) 2019-09-05 2021-03-11 Saudi Arabian Oil Company Propping open hydraulic fractures
CN113651550B (zh) * 2021-08-16 2022-05-17 中铁十局集团有限公司 一种泥岩和黏土地质盾构渣土改良分散剂及其制备与应用

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2531812A (en) * 1948-01-16 1950-11-28 Ernst A Hauser Application of drilling fluids
US2795545A (en) * 1953-04-14 1957-06-11 Monsanto Chemicals Organic materials
US2836555A (en) * 1956-07-30 1958-05-27 Arthur L Armentrout Material for recovering lost circulation in wells
US3313730A (en) * 1964-03-30 1967-04-11 Shell Oil Co Oleophilic clay powder
US3687846A (en) * 1970-06-02 1972-08-29 Int Minerals & Chem Corp High yield bentonites
IL41757A (en) * 1973-03-13 1976-03-31 Azrad A A method for activation of bentonite
US4137367A (en) * 1975-12-03 1979-01-30 Dresser Industries, Inc. Silane coated silicate minerals and method for preparing same
GB2164370B (en) * 1984-09-11 1988-01-27 Shell Int Research Drilling fluid
FR2581651B1 (fr) * 1985-05-13 1988-02-26 Rhone Poulenc Spec Chim Dispersants pour fluides de forage et fluides de forage les contenant
US4664818A (en) * 1985-07-26 1987-05-12 Newpark Drilling Fluid Inc. Drilling mud additive
US4664820A (en) * 1985-10-28 1987-05-12 Nl Industries, Inc. Preactivated organophilic clay gellant lubricating grease thickened with preactivated organophilic clay gellant and process for preparing preactivated organophilic clay gellants
US4740318A (en) * 1985-12-13 1988-04-26 Great Lakes Research Corp. Well drilling fluids and process for drilling wells
US4737295A (en) * 1986-07-21 1988-04-12 Venture Chemicals, Inc. Organophilic polyphenolic acid adducts

Also Published As

Publication number Publication date
DE69324026T2 (de) 1999-08-05
NO951092L (no) 1995-05-18
CA2145090A1 (en) 1994-03-31
ITMI922188A1 (it) 1994-03-24
JPH08503494A (ja) 1996-04-16
WO1994006881A1 (en) 1994-03-31
DK0662113T3 (da) 1999-10-11
NO951092D0 (no) 1995-03-22
EP0662113A1 (de) 1995-07-12
IT1255519B (it) 1995-11-09
CN1042740C (zh) 1999-03-31
CN1088955A (zh) 1994-07-06
ATE177777T1 (de) 1999-04-15
ES2128435T3 (es) 1999-05-16
US5646092A (en) 1997-07-08
DE69324026D1 (de) 1999-04-22
BR9307081A (pt) 1999-06-29
ITMI922188A0 (it) 1992-09-24

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